UPVC Window sill Query

skyblue33

Hello,

I'm looking at having a new bathroom window installed with trickle vents to help us with a condensation/damp bathroom issue. The wooden sill that is currently present is quite moldy and the sealant not in a good way as a result of this excess moisture.

My question is, should I rip out the existing wooden internal window sill and have a whole new UPVC sill fitted or just go over the top of the wood with a UPVC cap when we have the window replaced? I'd like to swap it out for UPVC in some respect to be able to stop the mould.

If it makes a difference, the bathroom window barely sees any sun due to the positioning of it on the side of the house (hence the damp issue).
Also, is there any negatives to having trickle vents installed?

We're also having a powerful extractor fan fitted in the ceiling to help get rid of the moisture.

Any advice appreciated, thanks!

Furts

A wooden window cill in a bathroom is not good practice. All homes built over the last 30-40 years, that I am aware of, have received tiled window cills.

Do not put a upvc capping over your window cill. The moisture in the room will encourage the cill to rot, but this will be hidden by the upvc covering. Hence you will not be aware of this happening until the woodlice start appearing!

I would have trickle vents in the bathroom, but many informed, respected, folk on this forum are against them. leveller2911 may wish to add a comment on this!

skyblue33

Thanks for your response. I figured it wouldn't be wise to put it over the top but wanted to check. Should I ask the window company to quote on a tile window sill then? I think our house was built in the 60s hence the pre-existing wooden sill...

Furts

It is your choice. You could have solid upvc if you wish. Window cills in bathrooms should not be timber because of the wet and risk of rotting. Upvc does not have this problem.